What is difference between Virtual function and Pure virtual function in C++?

C++ Interview Questions For Experienced

• Can a constructor throw an exception? How to handle the error when the constructor fails?
• What is the initializer list in C++?
• When do we use the Initializer List in C++?
• What is a copy constructor in c++?
• When are copy constructors called in C++?
• Why copy constructor take the parameter as a reference in C++?
• Why copy constructor argument should be const in C++?
• Can one constructor of a class call another constructor of the same class to initialize this object?
• Can a copy constructor accept an object of the same class as a parameter, in place of reference of the object? If No, why not possible?
• Are Constructors and destructors can declare as const?
• Can we make a copy constructor private in c++?
• Can you explain the order of execution in the constructor initialization list in c++?
• What is the conversion constructor in c++?
• What is the difference between a copy constructor and an overloaded assignment operator?
• What is the conversion operator in C++?
• When do we need to write a user-defined destructor?
• Why a class has only one destructor in c++?
• Can we have a virtual destructor in C++?
• When to use virtual destructors in c++?
• Can we have a virtual constructor in C++?
• Can you change ‘this pointer’ of an object to point to different objects in c++?
• Can you modify the ‘this pointer’ type in c++?
• Can I use realloc() on pointers allocated via new in c++?
• Why should C++ programmers minimize the use of ‘new’?
• Can I free() pointers allocated with new in c++?
• Is there any problem with the following c++ code : char*a=NULL, char& p = *a?
• Can I delete pointers allocated with malloc() ijn c++?
• How to call a non-const member function from a const member function in C++?
• When should I use references, and when should I use pointers?
• How virtual functions are implemented in C++?
• Is there a separate vtable for each object?
• Can virtual functions be inlined in c++?
• Can a virtual function is called inside a non-virtual function in C++?
• What is a pure virtual function in C++?
• What is difference between Virtual function and Pure virtual function in C++?
• Why is a pure virtual function initialized by 0 in c++?
• Can we access private data members of a class without using a member or a friend function?
• Can virtual functions be private in C++?
• What is an abstract class in c++?
• Write down some important points related to abstract function in c++?
• What is the difference between a concrete class and an abstract class in c++?
• What is a template function in c++?
• What is the difference between function overloading and templates in c++?
• Can we combine C and C++ code?
• How can I include a non-system C header file in my C++ code?
• What is the effect of extern “C” in C++?
• Why do C++ compilers need name mangling?
• What is typecasting in c++?
• When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used?
• How does the compilation/linking process work in c++?
• How to make a C++ class whose objects can only be dynamically allocated?
• What does the explicit keyword mean?
• How do you access the static member of a class in c++?
• Distinguish between shallow copy and deep copy in c++?
• Friend class and function in C++?
• What is the Diamond problem? How can we get around it in c++?
• Why virtual functions cannot be static in C++?
• What is the “mutable” keyword in C++?
• How to handle the exception in C++?
• What is a Memory Leak?
• Why static functions cannot access non-static variables in c++?
• What is a dangling pointer in c++?
• STL Containers – What are the types of STL containers?
• What are the functions of the scope resolution operator in c++?
• Write a program that describes the safe way to access one object to another in C++?
• Could you write an example code that describes the use of explicit keyword in c++
• Why is “using namespace std;” considered bad practice in c++?
• Why can templates only be implemented in the header file in c++?
• Do all virtual functions need to be implemented in derived classes in c++?
• Do all pure virtual functions need to be implemented in derived classes in c++?
• How to call a parent class function from a derived class function in c++?
• How to access members of the namespace in different files?
• How to convert a std::string to const char* or char* in c++?

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• C++ Interview Questions For Experienced

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